Augustus and the Late Unpleasantness, Episode Four

Augustus and Bill Wright set about searching for clues, all of which point to Charlotte having been a rather shady character. Ian tells his recollection of events to a wary Julia, who isn't sure what to make of him. Celia takes in a lodger at an unexpected moment, made worse by her distraction at having found the girls are gone.
And behind the strangeness of the day's events, a question must be asked: do we know our neighbors as well as we ought?